氧化石墨烯对脉动热管传热性能的影响

实验选用外径为4mm、内径为2mm的铜质脉动热管研究了氧化石墨烯对以去离子水和体积分数为50%的乙醇溶液为工质的脉动热管传热性能的影响。实验分别采用加有少量氧化石墨烯的去离子水溶液(简称氧化石墨烯水溶液)和体积分数为50%的乙醇溶液(简称氧化石墨烯乙醇溶液),氧化石墨烯质量分数均为0.03%。实验发现：氧化石墨烯对以去离子水为工质的脉动热管传热性能具有强化作用,对以体积分数为50%的乙醇溶液为工质的脉动热管传热性能的影响较差,但都和脉动热管的加热功率密切相关。对于以去离子水为工质的脉动热管,在加热功率低于20W时,氧化石墨烯对脉动热管的强化作用较弱；当加热功率在30～60W之间时,氧化石墨烯对脉动热管的强化作用较强,在3.71～11.33%之间,且强化作用随加热功率的增大呈逐渐增强趋势；但随着功率继续增大,氧化石墨烯的强化作用逐渐减弱,当加热功率达到80W后,热管传热性能减弱,原因可能是氧化石墨烯颗粒出现了沉降现象。

Experimental study on thermal performance of pulsating heat pipe with graphene oxide

An experimental study was conduct to investigate the effect of graphene oxide on heat transfer performance of pulsating heat pipe with deionized water and 50% concentration ethanol solution. The outside diameter of pulsating heat pipe is 4mm,the inner diameter 2 mm. Working fluid was separately deionized water and 50% ethanol solution plusing small amount of graphene oxide. The mass fraction of graphene oxide was 0.03%. The results show the graphene oxide can enhance the heat transfer performance of pulsating heat pipe filled with deionized water, and slightly enhance the heat transfer performance of pulsating heat pipe filled with ethanol. The influence is closely related with the heating power. For pulsating heat pipe of deionized water,when the heating power is less than 20W, the strengthening effect of graphene oxide is weak.when the heating power is in the range of 30 ~ 60W, the strengthening effect is strong,about 3.71~ 11.33%. With power increasing, the strengthening effect of graphene oxide is significantly increased.However, when the heating power is up to 80W, the heat transfer performance of heat pipe is weak due to the deposition of graphene oxide.